Credit gross-out theatrical magic and a mix of coffee grounds, flour and water for creating the crud-caked commode in the play, which was adapted from Irvine’s novel by Harry Gibson less than a year after the book came out.

“It’s meant to be revolting,” said Greg Esplin, who plays a doomed junkie and co-directs the raucous and sometimes incomprehensible show.

“The toilet helps drive the story of desperation,” he added. “It shows how far addicts will go for a fix.”

That point is all too relevant as the opioid crisis now ravages cities and small towns across the U.S.

And it’s driven home indelibly when Renton, an addict struggling to get off heroin played on film by Ewan McGregor, drops drugs down the toilet and swiftly retrieves them.